Weighted Grade Average

Often grades are computed using weighted grading. For example, in
my classes the exercise and projects are given different weights
toward your final grade.

How is a weighted grade computed?

For example, if a class weighting is given as:
10% for Exercise 1
20% for Exercise 2
30% for Exercise 3
40% for Exercise 4

You have four assignments. These four assignments will be used to
compute your grade (out of a total possible 100%).
Recall that percentages really mean "per 100". So if an exercise
is worth 10% it is worth 10/100 or .1 of your total grade.

Therefore - your weightings should total 100% (a good error
checking test in a computer program would be to check this and
have the user re-enter weights if this is incorrect).
To calculate the grade you would take the weighted value of each
grade:

Suppose you received grades of 90, 80, 85, and 95 on Exercise 1 to
4. You calculation would be:
weightedAverage = .1 * 90 + .2 * 80 + .3 * 85 + .4 * 95 = 88.5Looking at it another
way, consider when
you compute a non-weighted average of grades.

The numbers are added together and divided by the number of
exercises. This means each exercise is given an equal weighting.
So for example, (90+ 80 +85 + 95) / 4 = 87.5

or we could have rewritten it
as (90 + 80 + 85 + 95) * 1/4
or (90 + 80 + 85 + 95) * .25 and then distributed In
C++, you might have the weighting stored in a vector or array
(perhaps eventually as part of a class (as we move into OOP). A
simple code snippet may look something like this: